<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文件上传</title>
</head>
<body>

<form action="/upload" method="post" enctype="multipart/form-data">
    上传文件：
    <input name="filename" type="file">
    <button type="submit">提交</button>
</form>
</body>
</html>